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#include <fstream>
#define nmax 1200
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[nmax],b[nmax],c[nmax][nmax],n,m;
void afis(int i,int j)
{
if(!i||!j)
return;
if(a[i]==b[j])
afis(i-1,j-1),fout<<a[i]<<" ";
else
if(c[i-1][j]>c[i][j-1])
afis(i-1,j);
else
afis(i,j-1);
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int j=1;j<=m;j++)
fin>>b[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
c[i][j]=c[i-1][j-1]+1;
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
fout<<c[n][m]<<"\n";
afis(n,m);
return 0;
}